Hey elton, sry for being so annoying. For the layout I have been asking for. 1.25x,1.25x,1.25x,6.25x,1.5x,1.5x,1x,1x. Why is this infeasible? Is it the software limitation or the pcb doesn't support it?
The mid row in the following graph shows the layout I want.
Is it because when I use 1.25x,1.25x,1.25x,6.25x in the left, the current will only go through the circuit where 1.25x,1.25x,1.25x,1.25x lies in the right. Then even I put the switches in the 1.5x,1.5x,1x,1x, there would be not current passing these paths, thus these four keys can't be detected.